.tut_cat {
    background: #fff;
    float: left;
    width: 100%;
}
.tut_cat_inner {
    margin: 0 auto;
    padding-top: 30px;
    width: 980px;
}
.tut_cat_item {
    width: 220px;
    height: 320px;
    float: left;
    padding: 5px;
    margin: 6px;
    border: 1px solid #aaa;
    border-radius: 10px;
    background: #fff;
    box-shadow: 0px 0px 3px #ccc;
    overflow: hidden;
}
.tut_cat_item_img {
    width: 220px;
    height: 175px;
    overflow: hidden;
}
.tut_cat_item_img img {
    width: 220px;
    min-height: 175px;
}
.tut_cat_item h2 {
    font-size: 16px;
    line-height: 1.3em;
    padding: 5px 0px;
    color: #0096AF;
}
.tut_cat_item p {
    font-size: 13px;
    line-height: 1.3em;
}
.tut_detail {
    width: 100%;
    padding: 10px;
}
.tut_detail h1 {
    font-size: 18px;
}
.tut_detail p.date {
    font-size: 12px;
    color: #999;
    padding: 5px 0px;
}
.tut_detail h3 {
    font-size: 14px;
}
.tut_detail .tut_detail_detail {
    padding: 10px 0px;
}
.tut_detail_tags {
    float: left;
    width: 100%;
}
.tut_detail_tags a {
    margin: 3px 5px;
}